Multi index orthogonal experiment to optimize the extraction process of Radix Hedysari polysaccharide

Radix Hedysari polysaccharide yield,extract on DPPH free radical scavenging rate as the index,the effects of temperature,water quantity,extraction times and extraction time on the yield and antioxidant activity of polysaccharides were investigated by used the synthetic weighted mark method. Results showed that the extraction temperature was 70 ℃,15 times the amount of water extracted 2 times,each time 3 h. Alcohol concentration of 70%,the rate of polysaccharide was 5. 41%,DPPH removal rate was0. 832 5%.